It look like you either have a damaged data/mysql folder or you have tried to use a database from an old version of mysql with a newer version that is not directly compatible.
Is this a new installation of wamp?
How did you create/restore the database?
You could try running the mysql_upgrade.exe like it tells you. That can be found in
wamp/bin/mysql/mysql5.x.y/bin/nysql_upgrade.exe
Heres the doc to look at before you do that
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dev.mysql.com]